Machine for manufacturing sized sheets of flattened expanded metal



.me 2l, 1938. B. T; BALLARD ZET AL MACHINE FOR `1V1\NUFAC'I`URING' SIZED SHEETS OF FLATTENED EXPANDED METAL l Filed sept. 24, 1956 l 5 sheets-sheet lv "miauw-0Ry BER/va RD IT BALLARD NIL/.mn M. McNE/L ATT'QRY Bjfr. BALLARD ET AL MACHINE FOR MANUFACTURING SIZED SHEETS OF FLATTENED EXPANDEID METAL June 21, 1938;

Filed sept. 24, 19:56 v 5 sheets-sheet 2 INVENTOR Braun TALuuu WILL/An H. Melina. BY Ruf H un.

ATTokNEY y `June 21? 1938. B. T. ALLARD E-r AL l ,2,121,470

MACHINE FOR MANUFAC'IURING SIZED SHEETS CF FLATTENED EXPANDED METAL Filed Sept. '24, 19156 5 Sheets-Sheet 3 az. l

INVENToR |62 l |55 n W 'ATTORNEY y i June 21., 1938.` B. T. BALLARD ET AL A 2,121,470

MACHINE FOR MANUFACTURING SIZED SHEETS OF FLATTENED EXPANDED METAL Filed Sept. 24, 1936 5 ASheeiS-Shfet 4 IGO n Inumo Lun M. NCA/EIL jm@ 2L mg.

E. T. BALLARD ET AL MACHINE FOR MANUFACT'URING SIZED SHEETS OF .FLATTENED EXPANDBD METAL- -Patemed Janev 21, 193s v2,121.4'10 MACHINE Foa MANUFACTURING smin SHEETS or METAL FLATTENED EXPANDED `Bernard T. Ballard, Warren, Ohio, William M.

McNeil, Wheaton, and Ralph H. Hurd, Hinsvj. 'v dale, Ill., assignors to United States Gypsum Company, Chicago, rlll., a corporation of Illinois Application September 24, 1936, Serial No. 102,320

21 Claims.

This invention relates to machines for the manufacture of sized sheets of flattened expanded metal.

Flattened expanded metal is commonly made by passing ordinary expanded metal through heavy rolls which tends to flatten the bonds and strands into'the plane of the sheet. The flattened material is suitable for use as shelves for refrigerators, stoves, etc., when properly cut and lo stretched to size. The rolling and flattening operation, however, is apt to distort the diamonds of the expanded metal, causing the diamonds to be out of line. Furthermore, the rolled sheet is apt to be-of a width or length different from that 15 desired. If an attempt is made to shear this sheet to the desired dimensions the shear cut usually occurs at points other than through the center of the bonds, so that jagged points remain adjacent the shear cut which are a menace to the hands of the workmen handling the sheared sheets. It is desirable that the rolled sheets be of slightly smaller varea than the metal peripheral frame which is to form the support for the shelf, and then the sheet is stretched slightly to bring it to the nally desired .width or area.

An object of this invention, therefore, is to provide a machine for simultaneously sizing and shearing wide sheets of attened expanded metal so that the finished sheets are exactly the desired width. and so that the shear cut extends directly through the. center of the bonds, leaving no jagged points adjacent the shear cut.

Another object of the invention is to provide a machine in which provision is made for adjustment to accommodate expanded metal having diiferent strand and bond widths, for sheets of flattened expanded metal having different widths, and also adjustment to permit slight contraction in the width of the sheet during the stretchving or sizing operation also to improve machines for the manufacture of iiattened expanded metal ,in other respects hereinafter specified and claimed.

Reference is to be had to the accompanying drawings forming a part of this'specification, in which g Fig. lis a perspective view of our improved machine for simultaneously shearing and stretch 60 ing flattened expanded metal,

Fig. 2 isa plan view of the machine, Fig. 3 is a sectional elevation through the machine taken on line 3-3 of Fig. 2

Fig. 4 is a sectional elevation through the maf chine taken on line 4-4 of Fig. `2,

' shaft 26.

Fig. 5 is a sectional elevation Vthrough the machine taken on line 5-5 of Fig. 4,

Fig. 6 is a detail plan view of a portion of the machine showing the adjustable pins adjacent .the shear plate,

Fig. 7 is a detail plan view of the machine 5 showing the movable pins for supporting the sheet of attened expanded metal,

Fig. 8 is a sectional elevation through the machine takenl on line 8-8 of Fig. 6. 10

Fig. 9 is a sectional plan view through the machine taken on line 9-9 of Fig. 3,V

Fig. 10 is a sectional elevation through a portion of the machine taken on line lll- I0 of Fig. 6,

Fig. 11 is a sectional elevationthrough the ma- 15 chine taken on line II--II of Fig. 7,

Fig. 12 is a sectional elevation taken on line |2-I2 of Fig. '7, and

Fig. 13 is a perspective view of a shelf made through the use -of our improved machine. 20

Referring to. the drawings by numerals, the machine comprises main horizontal frame members 20 and 2l which are supported upon suitable legs or standards 22. Upright frame members 23 and 24 serve to vsupport an electric motor 25 25 or other suitable source of power, a horizontal shaft 26 being rotatably mounted in bearings -21 and 28 in the frame members 23 and 2l. an intermediate bearing 29 being also provided for said The shaft 2s is provided with a pair of eccentrics 30 and 3i adjacent the ends thereof, said eccentrics being connected by collars 32 and connecting rods 33 to pins 34 which are secured between upright ears 35 on a shear knife frame 36 35 to which is secured a shear knife 31. The shaft of motor 25 is provided with a pinion, not shown, within afgear housing '40, which meshes with a gear, also within the said housing, which is sey cured to a counter-shaft 4I, the latter being ro- 40 tatablymounted on the framework of the machine. The end of shaft 4l opposite the motor 25 is provided with a pinion, not shown, which meshes with a gear 4 2 mounted on shaft 26 with- .in a gear case 43. When the motor 25 is started 45 by-the operator pressing on a foot treadle M,

`shaft 26 is rotated through the speed reducing mechanism previously described, to cause the shear blade 31 to be lowered and shear oi a sheet of metal which' may extendbetween it land a 50 special lower shear blade to be more fully described. It will be recognized that the mechanism so farv described in detail, constitutes a standard power shear of a type well known tothe art.

65 table 41 adjacent the shear knife 81. The upper The salient feature of our invention consists in combining with4 the previously describedfpower shear. mechanism and instrumentalities where- -by' simultaneous shearing and stretching of by suitable bolts. A second flat slab movable shoulder 88 having an inner inclined locking surtable 48 of'high edgewise rigidity is slidably mounted on the framework of the machine in a manner to be hereinafter described. Sheets of flattened expanded metal 50 are usually formed by rolling ordinary expanded metal usually longitudinally of the diamonds between heavy rolls which serve to flatten down the bonds and strands from an inclined position into a common plane. We have found that sheets of flattened expanded .metal 30 inches by 8 feet are convenient for handling by\our improved machine, although sheets smaller than this can be utilized. or larger sheets may be used by -providing tables 41 and 48 of sufficient length to accommodate the sheets.

The sheets of flattened expanded metal are inserted edgewise into the machine below the shear blade 81 from the far side oi' the machine as seen in Fig. 1 with the diamonds extending parallel with said blade. A series of pins 5| is provided on the movable table 48 for engaging in the diamonds at the'entering edge of the sheet 50, and a series of pins 82 is supported on the flxed table 41 for engaging in a row of diamonds intermediate the edges of sheet 80. In order to support the pins 5|, the inward edge of table 48 is provided with a longitudinal slot 54 (Fig. 11) bounded on one edge with an inclined wedge surface I8, and on the opposite edge by a longitudinal face 81. Each of the pins 8| is rigidly secured to a block 88 whose lower surface 88 rests in the slot 84, being provided with an inclined lockingA shoulder 80 `which seats against the shoulder 51. One edge of each of the blocks 58 is provided with an inclined wedge surface 8|. A bar 82 extends longitudinally of the table 48 and inclined wedgesurfaces 88 and 44 are formed on the edges of said bar 82 so as to force the block shoulders l firmly against the locking surfaces 81 by means of bolts 85 which extend through the bar 82 and are threaded into the table 48. 'I'he blocks 58 and pins 8| are thus locked in position longitu# dinally of the table 4I so that each pin 8| engages in a diamond of the flattened expanded metal. By loosening'the bolts 85, the blocks 58 may be shifted longitudinally ofthe table 48 to suit expanded metal of various diamond lengths.

Each of the pins I2 is preferably formed on a slidable block Y88 which is provided with outstanding shoulders 88 whichv slidably engage within a slot 10 formed in the upper surface of a block 1|. An elongated bar 12`is L-shaped in cross section and is'rigidly bolted to the forward edge of surtace of bar 12 is provided with a longitudinal slideway or slot 18 which terminates at one edge in an inclined locking shoulder 14, and at the other edge in a vertical shoulder 18. Each of the blocks 1| is provided with a tongue or shoulder 18 which is supported in the slot 18, said shoulder 18 having its forward edge inclined to engage the shoulder 14. A series of identical blocks 1'| are thus supported in the slot 18 and a rectangular desired adjusted position so that the pins 52 register exactly with the. diamonds of the expanded metal being treated. Each of the blocks 68 and 1| is provided on its edge adjacent the shear knife 81 with slots 18 and 80 respectively which receive a shear knife 8| having a cutting edge 82. 'Ihe opposite edge of each block 1| is provided with a slot 88 which receives a rectangular bar 84. A pair of long screws 85.` extend through each block 1| and serve to securely attach together the bar 84, block 1| andv shear knife 8| .as a unit. The block 88 is somewhat shorter than the distance between shear knife 8| and bar 84, and is provided in the slo`t 11 with a spring recess 86 for receiving a compression spring 81 which normally tends to slide the block 68 rearwardly toward the bar 84, the rearward vmovement of said block being limited by an adjusting screw 88. Thus b y adjusting the screw 88, the distance between the cutting edge 82 and the flattened face of pin 52 can be varied slightly to accommodate expanded metal of different bond widths,so that the bond is severed exactly through its center to leave no jagged edges which might injure a workman.

In order to manipulate the sliding table 48 to accomplish the stretching of the flattened expanded metal simultaneously with the shearing of the bonds by the shear knife 31, we provide a mechanism to be hereinafter described, which is driven by tandem chains 80 connecting sprocket wheels 8| secured to shaft 28, with sprocket wheels 82 secured to a counter shaft 88. The shaft 88 is rotatably mounted in suitable bearings 84 on the framework of the machine, and a'. bevel gear 85 is secured to one end of said shaft and meshes with a bevel gear 88 secured to a cam shaft 81', the latter being rotatably mounted in bearings 88 supported on the framework of the machine. A cam |00 is secured .to the shaft 81 between the bearings 88. A rock lever |0| is pivotally mounted at its lower end, on a pin |02 which is secured in a bearing |08, the latter being secured to the floor |04,within a housing |05. The lever |0| has a bifurcated center section |06, and a roller |01 is rotatably mounted on a pin |08 between the legs of said section |06 so as to contact with the cam |00. A rod |08 is pivotally connected near the center of lever |0| and extends through the housing to receive a compression spring l0 which serves to maintain the roller |01 in firm contact with the cam |00, a turnbuckle being provided on said rod |08 for adjustment purposes. y

The upper end of lever |0| is pivotally connected to a connecting link ||2v by means of a pin ||3 at one end of said link. The other end of said link is formed into a bifurcated section |4 to which'the end of a spring rod ||5 is pivotally connected by means of a pin ||6. The rod ||5 extends into 'a spring tube or cylinder ||1 and a long compression spring ||8 extends around said rod within the tube ||1. The spring ||8 is confined between a collar ||8 threaded onto the end of rod III, and an annular cap |20 threaded onto the end of the cylinder ||1, the latter being provided with a lock nut |2I. The cylinder ||1, is slidably mounted for axial movement in a pair of bearings |22 and |28 which are rigidly secured to the framework of the machine. The spring I8 normally urges the cylinder I1 to the left as seen in Fig. 4, the axial movement of said cylinder ||1 being limited by a collar |24 which is threaded onto the rod ||5 adjacentthe pin ||6, said collar la pair of collars |28 and |29 are rigidly secured to the tube An annular ilange |30 is secured to the'tube ||1 to prevent axial movement of the collar |28, a key' |3|a on said flange |30 engaging in a registering keyway in the collar |28 to prevent said collar from rotating on said tube ||1.

A cap |3| is threaded onto the end of tube ||1 to prevent axial movement of the collar |29. A' cam |32 is secured to the collar |28 by means of a bolt |33, and a key |34 on said cam |32 engages in a longitudinal keyway in the collar |28. The bolt |33 passes through a slot |34 in the cam |32 so that when the bolt |33 is loosened, said cam may be adjusted axially of the tube ||1 to any desired adjusted position. by means of an adjusting bolt |35 which passes through a lug |36 on the collar |28 to engage said cam |32. An inclined cam surface |31 is formed on the cam |32 which engages a roller |38 the latter being, rotatably mounted on a pin |39 secured to a downstandlng shoulder |40 formed on aslide bar |4|.`

A similar cam |42 is secured to the collar |26 to engage a roller |43fwhich is rotatably mounted on a slide bar |44. As the rod I5 is moved axially to the left as seen in Fig. 4, under the action of cam |00, the collar ||3 compresses the spring H0 which also moves the tube ||1 to the leftso that cams |32 and |42 act on the rollers |30 and |43 to pull the bars |4| and |44 longitudinally to accomplish the stretching of the ilattened expanded metal in a manner to be more fully described. A pin I44A extends radially from the collar H0 and operates in a slot |45 in the tube ||1 to prevent the collar ||9 from rotating and changing its position on the rod |15 and thus,4

change'the compression of spring ||0 when once adjusted. The movement of the tube ||1 to the left, is limited by an adjusting screw |46 having a head |41 at its outer end. The screw |46 passes through an opening in the cap |3| and an annular collar"|48 on its inner end to contact with the cap |3| and linut the movement of the tube ||1 to the left so that the cams |32 and |42 accomplish exactly the desired stretching of the expanded metal. tends from the frame of the' machine adjacent the adjusting head |41 so that said screw |46 can beset to anydesired position, and a set screw |00 v engages said screw |46 to set it in said adjusted position.

V'The bars |4| and |44 are slidably mounted for longitudinal movement in the L-shaped slide frame members 20 and 2| respectively. Plates |64 and |55 are secured to the frame members 20 and 2|, by-screws |50 so as to confine the vbars 14| inframe members 20' and 2| with a sliding fit. Each of the bars |4| and |44 is'provided with an internal longitudinal slot |01 which is shaped to receive an elongated clamping bar |50. Each of the slotsl |61 opens at the inside ofthe bars |4| and |44, in a narrow slot |59 into which extends an elongated integral key formed on an shaped bracket 16|. A plurality of bolts |02 extend through a leg |62A of bracket |6i, through 'the key |60, and are threaded into the clamping bar |50 so as to adjustably clamp the brackets |6| onto the bars |4| and |44. A hori- A graduated indicator |49 ex.

zontal leg |63 is formed on each bracket |6|, and is secured by bolts |64 to the table l40, so as to -rigidly support said table. A pair of spaced flanges |65 connects the legs |62 and |63v of each bracket I6 and a threaded rod |66 passes loosely through said flanges, being threaded into a nut |61 which is received between each pair of said flanges |65. The outer end of each of ,said rods Y|00 passes through a flange |68 formed on the outer end of each bar |4|.and |44, being provided with an adjusting crank |69 for changing' the position of table 46 relative to the' bars |4| and |44 to produce different widths of sheets. It will be seen that the table 46, rods |66 and bars |4| and |44 reciprocate back and forth as a unit under the impulse of cam |00 which rotates intermittently when the operator presses foot treadle 44. In order to return the table 48 to its inner position after a stretching operation, we provide a pair of compression springs |10, each of which is coiled about a rod |1| having one end screwed into the shoulder |40, and the other end slidably received in a hole in a shoulder |12 formed on each of the frame members 20. The I The' sheets oi. flattened expanded metal are sheared off to the desired width with the shear.

cut extending exactly through the center of the bonds leaving no sharp points or edges, as stretch'- `ing to the desired size takes place simultaneously with the shearingopera-tion. The resulting strip of expanded metal is cross-sheared to the desired` length to produce a shelf having a peripheral frame bar |15 to which the sized sheetY of attened l expanded metal of exactly the right size is electro-welded or otherwise secured.

In operation, the strip of flattened expanded metal 50 is introduced crosswise between the shear blade 31, and a series of individual shear blades 8| The sheet is deposited within the diamonds along the leading edge of the sheet engaging the series of plus 5|, and a row of diamonds intermediate the edges of the sheet 50 engaging the series of pins 52. The operator then actuates the foot treadle 44 which starts the motor 26 and rotates shafts 4| and 26. The eccentrics' 30 and 3| then act through connecting rods 33 to lower shear blade 31 adjacent shear blades 8| so as to cut off a strip of flattened expanded metal exactly through the centers of the bonds.`

As the shear blade 31 is lowered, counter shaft 03 is rotated by chains 90 to rotate cam shaft 91 through Ibevel gears 95 and 36. Cam |00 on shaft 951 thenacts on roller |01 to rock lever' |0| and move rod ||5 axially to the left (Fig. 4) through link ||2. The spring H0 is compressed by collar ||0 lby the movement of rod H5, which causes tube ||1 to also move to the left in slide bearings |22 and |23 until the inside of cap v| |3 contacts with the stop shoulder |48 on adjustable rod |46. I'herod H5, however, continues to move to the left until the cam |00 makes half a revolution, after which the rod H5 moves to the right during the remainder of the revolution of the cam |00. As the tube ||1 moves to the left, it carries with it cams |32 and |42 which act on rollers |30 and |43 to move slide bars |4| and |44 outwardly' away from shear blade 31. The outward movement of cams |32 and |42 also carries the table 4 0 outwardly which causes the pins- 5| to stretch the flattened expanded metal the to accommodate expanded metal strips of different widths. bolts |82 are loosened and cranks I on rods Ill rotated the desired amount, after which :bolts Il! are again tightened' to lock the table Il to slide bars III and l". Pins I2 are adjustable relative to the shear blades 8i for different bond widths, by rotating adjusting screws Il, and are adjustable longitudinally of the bar 12 for different diamond lengths, by loosening set screws 1l. Pins 5i are adjustable longitudinally of the table Il by loosening set screws l5 function of the machine may be utilized without utilizing the shearing function. In other words, sheets of flattened expanded metal may be sized or stretched on the machine without shearing.

We would state in conclusion that, while the illustrated vexample constitutes a practical embodiment of our invention. we do not wish to limit ourselves precisely to these details, since manifestly the same may be considerably varied without departing from the spirit of' the invention as defined in the appended claims.

Having thus described our invention, we claim as new anddesire to secure by Letters Patent:

l. In a machine for shearing and stretching flattened expanded metal, a series of xed pins positioned adjacent cooperating shear blades, a series of movable pins in spaced, parallel relation to said flxed pins, and means for increasing the distance between said fixed and movable pins so as to stretch expanded metal on said pins as said expanded metal is sheared along one edge by said shear blades.

2. In a machine for shearing and stretching flattened expanded metal, a series of fixed pins positioned adjacentcooperatlng'shear blades. a series of movable pins in'spaced, parallel relation to said ilxed pins, and means for moving said movable pins away from said flxed pins a predetermined distance so as to stretch expanded metal supported by said pins as said expanded metal is sheared along one edge by said 'shear blades.

3. In a machine for shearing and stretching flattened expanded metal, a series of fixed pins positioned adjacent cooperating shear blades, a

. series of movable pins in spaced parallel relation to said flxed pins. slide members for slidably supporting said movable pins, and means for varying the distance between said flxed pins and said movable pins and slide members.

4. In a machine for shearing and stretchingv flattened expanded metal, a series of fixed pins positioned adjacent cooperating shear blades, a series of movable pins in spaced, parallel relation to said fixed pins.' slide members for slidably supporting said movable pins. and a cam for movlng said slide members and movable pins awayl from said fixed pins so as to stretch to a predetermined degree flattened'expanded metal supported on said fixed and movable pins.

5. In a machine for shearing and stretchingv flattened expanded metaLa series of nxed pins positioned adjacent cooperating shear-blades, a

series of movable pins in spaced, parallel relation to said fixed pins, slide members for slidably'supporting said movable pins, a tube having cam means for moving said slide members and movable pins upon axial movement of said tube, and means for moving said tube axially.

6. In a machine for shearing and stretching flattened expanded metal, means for engaging anedgeofasheet'ofsaid expanded metal, meansv .It should be lunderstood that the stretching for engaging said sheet intermediate the edges thereof, cooperating shear blades adjacent said intermediate engaging means, means for separating said engaging means to stretch said sheet, and simultaneously shearing of! a section of said sheet as said sheet is stretched.

7. In a machine for shearing and stretching flattened expanded metal. a series of fixed pins positioned adjacent cooperating shear blades, a series of movable pins in spaced, parallel relation to said ilxed pins, slide members for slidably supporting said movable pins, a tube having cam means for moving said slide members and movable pins upon axial movement of said tube, a compression spring, a rod within said tube for supporting said spring in compression, means for moving said rod axially of said tube so as to increase the compression of said spring and cause the axial movement of said tube and cam means so as to separate said xed and movable pins to accomplish the stretching of said metal as said metal is sheared.

8. A machine as described in claim 7 characterized by means for adjustably hunting the axial ymovement of saidotube and cams, and thus regulate the amount of stretching applied to said expanded metal.

9. .A machine as described in claim 7 characterized by a rotatable cam adaptedv to act on said rod and cause the axial movement of said tube.

10. A machine as described in claim 7 characterized by means for adjusting the position of said movable pins relative to said slide members so as to produce sheared sheets of expanded metal of varying width.

11. In a machine for shearing and stretching flattened expanded metal, means for engaging an edge of a sheet of said expanded metal, means'for engagingsaid sheet intermediate the edges thereof, cooperating shear blades adjacent said intermediateengaging means, a rotatable shaft adapted to cause said shear blades to shear off a strip of said sheet of flattened expanded metal, a

rotatable cam adapted to be driven from saidA shaft, and means associated with said shaft for thereof, cooperating shear blades adjacent said intermediate engaging means, slide members supporting said edge engaging means, cam means adapted to move said edge engaging means away from said intermediate means as said sheet is sheared so asto accomplish simultaneous shearing and stretching of said sheet, and spring means for returning said slide members to normal position after said shearing and stretching operations.

13. In a machine for shearing and stretching flattened expanded metal, a series of ilxed pins positioned adjacent cooperating shear blades, a

'series of movable pins in spaced, parallel relation to said ilxed pins. means for varying the distance between said two series of pins to accomplish stretching of a sheet of flattened expanded metal, and means for varying the distancebetween individual pins of each series to accommodate expanded metal of different diamond lengths.

14. In a machine for shearing and stretching flattened expanded metal, a series of fixed pins, a'series of movable pins in spaced, parallel rela,- tion to said fixed pins, a xed' shear lblade adjacent each iixed pin, a reciprocating shear blade' adjacent said series o! xed pins and shear blades, means for varying the distance between each fixed pin and each fixed shear blade so as to accommodate expanded metal of different bond width, and means for varying the distance between said fixed and movable pins to accomplish the stretching of said sheet of metal.

15. In a machine for shearing and stretching flattened expanded metal, a seriesY of ilxed .pins positioned adjacent cooperating shear blades, a series of movable pins in spaced, "parallel relation to said fixed pins, slide members for slidably supporting said movable pins, cam means for causing the movement of said slide members, and means for adjusting said cam means relative to said slide members so as to vary the movement of said slide members under the action of said cam means.

16. In a machine for stretching attened expanded metal, a series of fixed` pins, a series of movable pins in spaced, parallel relation to said xed pins, slide members for slidably supporting said movable pins, cam means mounted for substantially rectilinear movement, means on saidslide members positioned for engagement by said cam means, and means for operating lsaid cam means to move said slide members and movable pins away from said fixed pins so as to stretch to a predetermined degree flattenedl expanded metal supported on said fixed and movable pins.

17. In a machine for stretching flattened expanded metal, a series of `fixed pins. a series oi' movable pins in spaced, parallel relation to said fixed pins, slide members for slidably supporting said movable pins, a tube having cam means for l moving said slide members and movable pins upon axial movement of said tube, and means for moving said tube axially.

18. In a machine for stretching attened expanded metal, a series of fixed pins, a series of movable pins in spaced, parallel relation to' said fixed pins, slide members for slidably supporting said movable pins, a tube having cam means for moving said slide members and movable'pins upon axial movement of said tube, a compression spring, a rod within said tube for supporting said spring in compression, means for moving said rod axially vof said tube so as to increase the compression of said spring and cause the axial movement of said tube and cam means so as to separate said xed and movable pins to accomplish the stretching of said expanded metal.

19. A machine as described in claim 18 characterized by means for adjustably hunting the axial movement of said tube and cams, andthus regulate the amount of stretching applied to said expanded metal.- p

20. A machine as described in claim 18 characterized by a rotatable cam adapted to act on said rod and cause the axial movement of said tube.

21. In a machine for stretching flattened expanded metal, a series o f xed pins, a series of movable pins in spaced, parallel relation to said fixed pins, slide members for slidably supporting said movable pins, cam means forcausing the movement of said slide members, and means for adjusting said cam means relative to said slide members so as to vary the movement of said slide members under the action vof said cam means.

BERNARD T. BALLARD. WILLIAM M. McNEIL. RALPHHL HURD. 

